Terlouw E M, Lawrence A B, Koolhaas J M, Cockram M
Genetics and Behavioural Sciences Department, Scottish Agricultural College-Edinburgh, UK.
Physiol Behav. 1993 Jul;54(1):189-93. doi: 10.1016/0031-9384(93)90065-n.
Previous work has shown that stereotypies, such as chain manipulation and excessive drinking, only develop in food-restricted sows. Furthermore, once stereotypies have been developed, ingestion of a small meal specifically stimulates the performance of stereotypes. These results suggest that the occurrence of stereotypies may strongly depend on the individual's nutritional status. As glucose is one of the main metabolic fuels, the present experiment investigated whether individual differences and/or daily variations in levels of chain manipulation and excessive drinking are correlated to individual differences and/or daily variations in pre- or postfeeding glucose concentrations. Blood samples were taken at regular intervals prior to, during, and after feeding, from sows that had developed stereotypies to different degrees over a period of 110 days of restrictive housing and feeding conditions. Glucose concentrations were low prior to and high after feeding. Levels of stereotypies showed similar variations, suggesting that the performance of stereotypies is not related to low glucose concentrations. Furthermore, whilst sows differed consistently in glucose concentrations, no correlations were found between individual glucose concentrations and stereotypies. Similarly, no correlations were found between glucose concentrations and chain manipulation or drinking on a sample to sample basis. These data show that although performance of stereotypies is strongly dependent on feeding regime, it is not related to plasma glucose concentrations.
先前的研究表明，诸如连锁行为和过度饮水等刻板行为仅在食物受限的母猪中出现。此外，一旦刻板行为形成，摄入少量食物会特别刺激刻板行为的表现。这些结果表明，刻板行为的发生可能很大程度上取决于个体的营养状况。由于葡萄糖是主要的代谢燃料之一，本实验研究了连锁行为和过度饮水水平的个体差异和/或每日变化是否与喂食前或后葡萄糖浓度的个体差异和/或每日变化相关。在110天的限制性饲养和喂食条件下，对已形成不同程度刻板行为的母猪，在喂食前、喂食期间和喂食后定期采集血样。喂食前葡萄糖浓度低，喂食后高。刻板行为水平呈现类似的变化，这表明刻板行为的表现与低葡萄糖浓度无关。此外，虽然母猪的葡萄糖浓度始终存在差异，但未发现个体葡萄糖浓度与刻板行为之间存在相关性。同样，在逐个样本的基础上，未发现葡萄糖浓度与连锁行为或饮水之间存在相关性。这些数据表明，虽然刻板行为的表现强烈依赖于喂食方式，但与血浆葡萄糖浓度无关。
